Which of these examples would be classified as a longitudinal wave?

A) X-Ray

B) Red Light

C) Shock Wave

D) Radio Wave

Longitudinal waves are waves that have vibrations along or parallel to their direction of travel. Examples of longitudinal waves are sound waves, waves in a slink, tsunami waves, vibrations in gases, oscillations in springs, internal-water waves, ultra sounds, earthquake P-waves.

An example would be a Tsunami wave